The Saro, or Nigerian Creoles of the 19th and early 20th centuries, were Africans that were emancipated and initially resettled in Freetown, Sierra Leone by the Royal Navy, which, with the West Africa Squadron, enforced the abolition of the international slave trade after the British Parliament passed the Slave Trade Act 1807. Those freedmen who migrated back to Nigeria from Sierra Leone, over several generations starting from the 1830s, became known locally as Saro (elided form of Sierra Leone, from the Yoruba sàró). Consequently, the Saro are culturally descended from Sierra Leone Creoles, with ancestral roots to the Yoruba people of Nigeria.

Nigeria, officially the Federal Republic of Nigeria, is a country in West Africa. It is situated between the Sahel to the north and the Gulf of Guinea to the south in the Atlantic Ocean. It covers an area of 923,769 square kilometres (356,669 sq mi), and with a population of over 230 million, it is the most populous country in Africa, and the world's sixth-most populous country. Nigeria borders Niger in the north, Chad in the northeast, Cameroon in the east, and Benin in the west. Nigeria is a federal republic comprising 36 states and the Federal Capital Territory, where the capital, Abuja, is located. The largest city in Nigeria is Lagos, one of the largest metropolitan areas in the world and the largest in Africa.